class ActiveModelSerializers::Adapter::JsonApi::Relationship

def as_json
  hash = {}
  hash[:data] = data if association_options[:include_data]
  links = self.links
  hash[:links] = links if links.any?
  meta = self.meta
  hash[:meta] = meta if meta
  hash
end

def data_for(serializer)
  if serializer.respond_to?(:each)
    serializer.map { |s| ResourceIdentifier.new(s, serializable_resource_options).as_json }
  elsif association_options[:virtual_value]
    association_options[:virtual_value]
  elsif serializer && serializer.object
    ResourceIdentifier.new(serializer, serializable_resource_options).as_json
  end
end

def initialize(parent_serializer, serializer, serializable_resource_options, args = {})
  @object = parent_serializer.object
  @scope = parent_serializer.scope
  @association_options = args.fetch(:options, {})
  @serializable_resource_options = serializable_resource_options
  @data = data_for(serializer)
  @links = args.fetch(:links, {}).each_with_object({}) do |(key, value), hash|
    hash[key] = ActiveModelSerializers::Adapter::JsonApi::Link.new(parent_serializer, value).as_json
  end
  meta = args.fetch(:meta, nil)
  @meta = meta.respond_to?(:call) ? parent_serializer.instance_eval(&meta) : meta
end